单项选择题

A small light tackle with blocks of steel or wood that is used for miscellaneous small jobs is called a（）.

A.snatch block
B.threefold purchase
C.handy-billy
D.chockablock

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单项选择题
A single heavy wire made up for the topping lift is called a（）.

A.Bale
B.Spanner wire
C.Bull line
D.Working guy
单项选择题
A device used to enlarge the size of an existing bore hole，having teeth arranged on its outside circumference to cut the formation as it rotates is a（n）（）.

A.Enlarger bit
B.Casing bit
C.Hole opener
D.Casing opener
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